5A
A/T Symptom Diagnosis
Trouble diagnosis 1
Electrical Repair
Condition Possible Cause Action
Excessive shift shock
Shift solenoid valve-A and/or -B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
(Only when N → D or 3 ↔ 4 shifting)
Timing solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Input shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Transmission fluid temperature sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Engine speed signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Engine torque signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Torque reduction request signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Crank position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
No gear shift as 3rd gear
Shift solenoid valve-A and/or -B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Timing solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
Poor 1 → 2 shift
Shift solenoid valve-B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Transmission range sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Poor 2 → 3 shift
Shift solenoid valve-A circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Transmission range sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Poor 3 → 4 shift
Shift solenoid valve-B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Timing solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Input shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Transmission range sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Transmission fluid temperature sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Engine coolant temperature signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Engine speed signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Engine coolant temperature sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Crank position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
“3” position switch circuit faulty
Refer to No Gear Shift to 4th Gear .
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Poor 4 → 3 shift
Shift solenoid valve-B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Timing solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Input shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
O/D off switch circuit faulty
Refer to No Gear Shift to 4th Gear .
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Poor 3 → 2 shift
Shift solenoid valve-B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Poor 2 → 1 shift
Shift solenoid valve-B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Incorrect gear shift point
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Non operate TCC (lock-up) system
TCC solenoid valve-B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Shift solenoid valve-A and/or -B circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Output shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Input shaft speed sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Transmission range sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Transmission fluid temperature sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
CAN communication circuit faulty
(M13 engine model with VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Engine coolant temperature signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Throttle position signal circuit faulty
(M13 engine model without VVT)
Inspect circuit for open, short and intermittent. If NG, repair.
Brake light switch circuit faulty
Refer to No Gear Shift to 4th Gear .
Throttle position sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
Engine coolant temperature sensor circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
ECM
Substitute a known-good ECM and recheck.
Higher or lower stall speed
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.
Excessive “N” → “D” or “N” → “R” time lag
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. if NG, repair.
Transmission fluid temperature sensor circuit faulty
Inspect circuit for open, short and intermittent. if NG, repair.
TCM
Substitute a known-good TCM and recheck.
Higher or lower line pressure
Pressure control solenoid valve circuit faulty
Inspect circuit for open, short and intermittent. If NG, repair.
TCM
Substitute a known-good TCM and recheck.

Trouble diagnosis 2
On-vehicle Repair
Condition Possible Cause Action
Unable to run in all range
Faulty valve body component
Replace valve body assembly.
Excessive shift shock
Engine abnormal condition
Inspect and repair engine.
Malfunction of shift solenoid valve-A and/or -B
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of input shaft speed sensor
Inspect. If NG, replace.
Malfunction of transmission range sensor
Inspect. If NG, replace.
Malfunction of Transmission fluid temperature sensor
Inspect. If NG, replace.
(Only when N → D or 3 ↔ 4 shifting)
Malfunction of timing solenoid valve
Inspect. If NG, replace.
Malfunction of pressure control solenoid valve
Inspect. If NG, replace valve body assembly.
(Except N → D or N ↔ R shifting)
Malfunction of brake light switch
Inspect. If NG, replace.
Malfunction of crank position sensor
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Faulty valve body component
Replace valve body assembly.
Poor 1 → 2 shift
Malfunction of shift solenoid valve-B
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of transmission range sensor
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Faulty valve body component
Replace valve body assembly.
Poor 2 → 3 shift
Malfunction of shift solenoid valve-A
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of transmission range sensor
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Faulty valve body component
Replace valve body assembly.
Poor 3 → 4 shift
Malfunction of shift solenoid valve-B
Inspect. If NG, replace.
Malfunction of timing solenoid valve
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of input shaft speed sensor
Inspect. If NG, replace.
Malfunction of transmission range sensor
Inspect. If NG, replace.
Malfunction of Transmission fluid temperature sensor
Inspect. If NG, replace.
Malfunction of “3” position switch
Inspect. If NG, replace.
Malfunction of engine coolant temperature sensor
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Malfunction of pressure control solenoid valve
Inspect. If NG, replace valve body assembly.
Faulty valve body component
Replace valve body assembly.
Poor 4 → 3 shift
Malfunction of shift solenoid valve-B
Inspect. If NG, replace.
Malfunction of timing solenoid valve
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of input shaft speed sensor
Inspect. If NG, replace.
Malfunction of “3” position switch
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Malfunction of pressure control solenoid valve
Inspect. If NG, replace valve body assembly.
Faulty valve body component
Replace valve body assembly.
Poor 3 → 2 shift
Malfunction of shift solenoid valve-A
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Faulty valve body component
Replace valve body assembly.
Poor 2 → 1 shift
Malfunction of shift solenoid valve-B
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Faulty valve body component
Replace valve body assembly.
Incorrect shift point
Engine abnormal condition
Inspect and repair engine
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Non operate TCC (lock-up) system
Malfunction of TCC solenoid valve
Inspect. If NG, replace.
Malfunction of shaft solenoid valve-A and/or -B
Inspect. If NG, replace.
Malfunction of output shaft speed sensor
Inspect. If NG, replace.
Malfunction of input shaft speed sensor
Inspect. If NG, replace.
Malfunction of transmission range sensor
Inspect. If NG, replace.
Malfunction of transmission fluid temperature sensor
Inspect. If NG, replace.
Malfunction of pressure control solenoid valve
Inspect. If NG, replace valve body assembly.
Malfunction of brake light switch
Inspect. If NG, replace.
Malfunction of throttle position sensor
Inspect. If NG, replace.
Malfunction of engine coolant temperature sensor
Inspect. If NG, replace.
Faulty valve body component
Replace valve body assembly.
Excessive “N” → “D” or “N” → “R” time lag
Malfunction of transmission fluid temperature sensor
Inspect. If NG, replace.
Pressure control solenoid valve circuit faulty
Inspect. If NG, replace valve body assembly.
Clogged oil strainer
Replace.
Faulty valve body component
Replace valve body assembly.

Trouble diagnosis 3
Off-vehicle Repair
Condition Possible Cause Action
Unable to run in all range
Faulty oil pump
Inspect. If NG, replace.
Seized or broken planetary gear
Inspect. If NG, replace.
Faulty one-way No.2 clutch
Inspect. If NG, replace.
Damaged drive plate
Inspect. If NG, replace.
Faulty forward clutch
Inspect. If NG, replace.
Faulty reverse clutch
Inspect. If NG, replace.
Faulty 1st and reverse brake
Inspect. If NG, replace.
Faulty torque converter
Replace.
Excessive “N” → “D” shift shock
Faulty forward clutch
Inspect. If NG, replace.
Excessive “N” → “R” shift shock
Faulty reverse clutch
Inspect. If NG, replace.
Faulty 1st and reverse brake
Inspect. If NG, replace.
Poor 1 → 2 shift, excessive shock or slippage
Faulty 2nd brake
Inspect. If NG, replace.
Faulty one-way No.1 clutch
Inspect. If NG, replace.
Poor 2 → 3 shift, excessive shock or slippage
Faulty direct clutch
Inspect. If NG, replace.
Poor 3 ↔ 4 shift, excessive shock or slippage
Faulty forward clutch
Inspect. If NG, replace.
Faulty O/D and 2nd coast brake
Inspect. If NG, replace.
Poor 3 → 2 shift, excessive shock or slippage
Faulty direct clutch
Inspect. If NG, replace.
Faulty one-way No.1 clutch
Inspect. If NG, replace.
Poor 2 → 1 shift, excessive shock or slippage
Faulty 2nd brake
Inspect. If NG, replace.
Faulty one-way No.2 clutch
Inspect. If NG, replace.
Non operate TCC (lock-up) system
Faulty torque converter
Replace.
Excessive “N” → “D” time lag
Faulty oil pump
Inspect. If NG, replace.
Faulty forward clutch
Inspect. If NG, replace.
Faulty one-way No.2 clutch
Inspect. If NG, replace.
Leakage from “D” range fluid pressure circuit
Overhaul or replace valve body assembly.
Excessive “N” → “R” time lag
Faulty oil pump
Inspect. If NG, replace.
Faulty reverse clutch
Inspect. If NG, replace.
Faulty 1st and reverse brake
Inspect. If NG, replace.
Leakage from “R” range fluid pressure circuit
Overhaul or replace valve body assembly.
Poor engine brake in downshift to “2” range
Faulty O/D and 2nd coast brake
Inspect. If NG, replace.
Poor engine brake in downshift to “L” range
Faulty 1st and reverse brake.
Inspect. If NG, replace.